Preparation, microstructure and properties of C sf /SiC multilayer - - PowerPoint PPT Presentation

▶
preparation microstructure and properties of c sf sic
SMART_READER_LITE
LIVE PREVIEW

Preparation, microstructure and properties of C sf /SiC multilayer - - PowerPoint PPT Presentation

Aug 13, 2022 114 likes •336 views

International Conference on Mechanics of Nano, Micro and Macro Composite Structures International Conference on Mechanics of Nano, Micro and Macro Composite Structures International Conference on Mechanics of Nano, Micro and

slide-1
SLIDE 1

International Conference on Mechanics of Nano, Micro and Macro Composite Structures International Conference on Mechanics of Nano, Micro and Macro Composite Structures International Conference on Mechanics of Nano, Micro and Macro Composite Structures International Conference on Mechanics of Nano, Micro and Macro Composite Structures

Preparation, microstructure and properties

  • f Csf/SiC multilayer composites by tape

casting and pressureless sintering

Wenshu Wenshu Wenshu Wenshu Yang Yang Yang Yang, , , , Elisa Elisa Elisa Elisa Padovano, Padovano, Padovano, Padovano, Laura Laura Laura Laura Fuso, Fuso, Fuso, Fuso, Matteo Matteo Matteo Matteo Pavese, Pavese, Pavese, Pavese, Silvia Silvia Silvia Silvia Marchisio, Marchisio, Marchisio, Marchisio, Dreidy Dreidy Dreidy Dreidy Vasquez, Vasquez, Vasquez, Vasquez, Claudia Claudia Claudia Claudia Vega Vega Vega Vega bolivar, Paolo Fino, Claudio Badini bolivar, Paolo Fino, Claudio Badini bolivar, Paolo Fino, Claudio Badini bolivar, Paolo Fino, Claudio Badini HTMAT HTMAT HTMAT HTMAT group, group, group, group, Department Department Department Department of Applied Science and

  • f Applied Science and
  • f Applied Science and
  • f Applied Science and

Technology Technology Technology Technology, Politecnico di Torino, Italy Politecnico di Torino, Italy Politecnico di Torino, Italy Politecnico di Torino, Italy Email: wenshu.yang@polito.it Email: wenshu.yang@polito.it Email: wenshu.yang@polito.it Email: wenshu.yang@polito.it

slide-2
SLIDE 2

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

Outline

Introduction Materials and Experimental Results and Discussion Conclusions Acknowledgments

slide-3
SLIDE 3

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 1. Introduction

Properties Properties Properties Properties α α α α-

  • SiC

SiC SiC SiC β β β β-

  • SiC

SiC SiC SiC Crystal structure hexagonal cubic Melting Point (℃) 2730 >1800 (Transform into α-SiC) Density (g/cm3) 3.21 3.21 Bulk modulus (GPa) 220 250 Elastic modulus (GPa) 450 400 Hardness RT (GPa) 36 32 CTE ( 10−6 ℃−1) 4.7 —

) ( CO ) ( SiO ) ( O 2 3 ) ( SiC

2 2

g s g s + = +

) ( CO ) ( SiO ) ( O 2 ) ( SiC

2 2 2

g s g s + = + (1) (2)

Passive oxidation

Low fracture toughness at room temperature

slide-4
SLIDE 4

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 1. Introduction
  • Introduction of second phase (composite)

I. Particulates II. Whiskers

  • III. Continuous fibres
  • IV. Short fibres
  • Multilayers
  • Multilayer composite

Toughing strategies Crack deflection, pull-out and bridging of fibre or whicker, and interface delamination

slide-5
SLIDE 5

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 1. Introduction

Toho Tenax HTA40 fibre with epoxy coating Cut fibre Residual C

  • 1. L. Fuso, D. Manfredi, S. Biamino, M. Pavese, P. Fino, C. Badini. SiC-based multilayered composites containing

short carbon fibres obtained by tape casting. Composites Science and Technology. 2009, 69: 1772–1776.

slide-6
SLIDE 6

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 1. Introduction
  • To obtain Csf/SiC multilayer composites by tape casting

and pressureless sintering.

  • To

investigate the effect

  • f

short C fibre

  • n

microstructure, mechanical and thermal conductivity properties of Csf/SiC multilayer composites

Purporses of This Study

slide-7
SLIDE 7

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 2. Experimental

α-SiC B and C as sintering aids Ethanol and butanol as solvent Fish oil as dispersant Polyvinyl butyral as binder Polyethylene glycol as plasticizer

  • 2. Matteo Pavese, Paolo Fino, Alberto Ortona, Claudio Badini. Potential of SiC multilayer ceramics for high

temperature applications in oxidising environment. Ceramics International. 2008, 34: 197–203.

Tape Casting Stacking and debinding Pressureless sintering SiC multilayer Dispersant Toho HTC 124 (Water soluble sizing) Ultrasonic Mechanical stirring Csf/SiC multilayer composites

slide-8
SLIDE 8

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

(a) (f) (e) (d) (c) (b) Without dispersant + BYK 163 + BYK 410 + BYK 2150 + BYK 9077 + BYK 9076

  • 3. Results and Discussion

Effect of dispersant (1 wt.%) on fibre dispersion (0.075 vol%) in mixture of ethanol and butanol: (a) BYK-163, (b) BYK-410, (c) BYK-2150, (d) BYK-9077, (e)BYK-9076, (f) Triton X-100.

(g) + Triton X100

  • 3. W.S Yang, L. Fuso, S. Biamino, D. Vasquez, C. Vega Bolivar, P. Fino, C. Badini. Fabrication of short carbon fibre

reinforced SiC multilayer composites by tape casting. Ceramic International. 2012, 38(2): 1011–1018.

slide-9
SLIDE 9

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

Tape casting direction Tape casting direction

Observation

slide-10
SLIDE 10

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

Typical fibre length distribution after 6 h mechanical mixture of SiC slurry and the fibre-predispersed solution. Statistical result of fibre length distribution after 6 h mechanical mixture of SiC slurry and the fibre-predispersed solution. 3 mm → 600 µm 3 mm → 60 µm

  • 4. Zhang Y, Li S, Han J, Zhou Y. Fabrication and characterization of random chopped fiber reinforced

reaction bonded silicon carbide composite. Ceramics International. 2012, 38: 1261-1266.

slide-11
SLIDE 11

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

5 vol% 10 vol% 15 vol% Fracture surface of Csf/SiC multilayers with different fibre content after debinding.

  • 5. W.S Yang, S. Biamino, E. Padovano, L. Fuso, M. Pavese, S. Marchisio, D. Vasquez, C. Vega Bolivar, P. Fino, C. Badini.

Microstructures and mechanical properties of short carbon fibre/SiC multilayer composites prepared by tape

  • casting. Composites Science and Technology. 2012, 72: 675–680.
slide-12
SLIDE 12

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

5 vol% 15 vol%

(a)

50 µm

10 vol%

(d)

50 µm

(c)

50 µm

(b)

50 µm

SiC

Representative morphology of sintered SiC multilayer and Csf/SiC multilayer composites.

  • 5. W.S Yang, S. Biamino, E. Padovano, L. Fuso, M. Pavese, S. Marchisio, D. Vasquez, C. Vega Bolivar, P. Fino, C. Badini.

Microstructures and mechanical properties of short carbon fibre/SiC multilayer composites prepared by tape

  • casting. Composites Science and Technology. 2012, 72: 675–680.

XRD patterns of SiC multilayer and Csf/SiC multilayer composites.

slide-13
SLIDE 13

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

Relationships among fibre content, relative density and elastic modulus or bending strength of SiC multilayer and Csf/SiC multilayer composites.

  • 5. W.S Yang, S. Biamino, E. Padovano, L. Fuso, M. Pavese, S. Marchisio, D. Vasquez, C. Vega Bolivar, P. Fino, C. Badini.

Microstructures and mechanical properties of short carbon fibre/SiC multilayer composites prepared by tape

  • casting. Composites Science and Technology. 2012, 72: 675–680.
slide-14
SLIDE 14

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

Materials Fibre content (vol%) Relative density (%) Shrinkage (%) Length Width Thickness SiC multilayer 88.8 19.1 20.7 21.4 Csf/SiC multilayer composites 5 83.1 5.1 19.0 31.7 10 81.3 3.9 15.1 26.4 15 72.0 3.0 13.1 29.8

  • 5. W.S Yang, S. Biamino, E. Padovano, L. Fuso, M. Pavese, S. Marchisio, D. Vasquez, C. Vega Bolivar, P. Fino, C. Badini.

Microstructures and mechanical properties of short carbon fibre/SiC multilayer composites prepared by tape

  • casting. Composites Science and Technology. 2012, 72: 675–680.
slide-15
SLIDE 15

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

5 vol% 15 vol% 10 vol% SiC

Fracture surface SiC multilayer and Csf/SiC multilayer composites.

  • 5. W.S Yang, S. Biamino, E. Padovano, L. Fuso, M. Pavese, S. Marchisio, D. Vasquez, C. Vega Bolivar, P. Fino, C. Badini.

Microstructures and mechanical properties of short carbon fibre/SiC multilayer composites prepared by tape

  • casting. Composites Science and Technology. 2012, 72: 675–680.
slide-16
SLIDE 16

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

Oxidation curves of SiC multilayer and Csf/SiC multilayer composites.

  • 5. W.S Yang, S. Biamino, E. Padovano, L. Fuso, M. Pavese, S. Marchisio, D. Vasquez, C. Vega Bolivar, P. Fino, C. Badini.

Microstructures and mechanical properties of short carbon fibre/SiC multilayer composites prepared by tape

  • casting. Composites Science and Technology. 2012, 72: 675–680.

Materials C fibre content Free carbon content (wt.%) Maximum weight loss up to 1300 °C (wt.%) in volume (vol%) in weight (wt.%) SiC multilayer — — 4.5 0.2 Csf/SiC multilayer composites 5 2.8 4.4 2.4 10 5.8 4.2 5.7 15 8.9 4.1 11.2

slide-17
SLIDE 17

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

Effect of fibre amount on specific heat of multilayers

(a)

Thermal diffusivity-Temperature relationship of pure SiC and Cf/SiC in Z direction (a) before and (b) after 1500ºC/5h oxidation

(b) (a) (b)

Thermal diffusivity-Temperature relationship of pure SiC and Cf/SiC in Z direction (a) before and (b) after 1500ºC/5h oxidation Thermal conductivity of pure SiC and Cf/SiC multilayers in Z direction at (a) 100 and (b) 1500ºC

(a) (b)

R.G. Munro. Material properties of a sintered α-SiC. J. Phys. Chem. Ref. Data. 1997, 26(5): 1195-1203.

  • 3. Results and Discussion
slide-18
SLIDE 18

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 3. Results and Discussion

Inner materials SiC Multilayer Csf/SiC Multilayer Heat flux The outer dense SiC layers are expected to provide excellent

  • xidation resistance and good heat conductivity in the plane.

The Csf/SiC layers in the middle of the multilayer architecture could grant acceptable thermal conductivity in plane and low conductivity through the TPS thickness.

slide-19
SLIDE 19

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

  • 4. Conclusions
  • Nonionic surfactant Triton X100 was the best dispersant for the C

fibres under present investigation.

  • Short C fibres distributed uniformly in the green tape and tended to

align along the tape casting direction.

  • Addition of short C fibers hindered the shrinkage during sintering

and resulted in enhanced residual porosity.

  • Elastic modulus of Csf/SiC multilayer composites decreased linearly

with fibre amount. Bending strength presented clear relationship with the relative density.

  • The addition of short C fibres could decrease the thermal

conductivity through thickness direction. It could be exploited by integrating the porous Csf/SiC multilayer composites in TPS, with the aim of improving their insulation capability through the thickness without decreasing the thermal conductivity in the plane.

slide-20
SLIDE 20

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

Acknowledgments

  • Part of this work has been performed within

the framework

  • f

the European Project ‘‘SMARTEES’’ (G.A. n. 262749) with the financial support by the European Community.

  • Wenshu Yang also would like to acknowledge

the Chinese Scholarship Council (CSC) for financial support (2009612050).

slide-21
SLIDE 21

ICNMMCS ICNMMCS ICNMMCS ICNMMCS

Thank you for your attention!